Motor-controller.



0.1. HENDERSON.

' MOTOR CONTROLLER.

AYPLIOATIOH FILED OUT. 17, 1908.

Patented May 22, 1913.

' 2 SHEETS-SHEET 1.

Eva/225% o o m 0 onouoluumnruo o o o m x Ill 0. 'r. HENDERSON.

MOTOR CONTROLLER. APPLICATION nnnn 00117, mos.

Patented May 27, 1913.

2 SHBETSSHEET 2v KWZQ 5/ (54m mwrmm UNITED STATES I CLARK T, HENDERSON, OF MILVZAUKEE, VJISCQNSIN, ASSIGNOE TO THE CUTLER HAMMER MFG. 00., OF MILWAUKEE, WISGONEIN, COBIEURATION 1311" 'i/VISGQNSIN.

, MOTOR-GOITEDLLER.

To all whom it may cancer-11 lie it known that I, CHARK T. Hnnnna: sex, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of \Visconsin, have invented new anduseful Improvements in Motor-Controllers, of which the following is a full, clear, concise and exact description, reference being had to the accompanying drawing, forming av part of this specification.

My invention relates to table elevating mechanisms for rolling mills.

In three-high rollingmills tables are provided to carry the bloom, which tables are lowered to pass the bloom through the lower rolls and raised to pass it through the upper rolls.

. My invention has for one of its objects toprovide means whereby the table elevating mechanism may be operated byan electric motor.

It has for a further object, to providethe motor controller with certain improved means whereby' it will automatically stop the motor after it has run through a pr deter 'nined cycle.

In order .to more fully explain the nature of my invention. I have illustrated the gen eral features thereof in the acconn'ianying drawing. in which Figure 1 illustrates schematically} a threehigh rolling mill. Fig. 2 shows a plan view of the motor and the crank and Fig. P) illustrates diagrammatically one form of my control system.

These drawings merely illustrate the gencral features of my invention and other up paratus; which may be used in practice in connection with that which I have illustratedf Much has been eliminated for the purpose of simplifying the disclosure which I make herein. and, therefore, the drawings should he considered in an illustrative sense and not in a limiting manner.

I shall first describe the mechanical mech anism for operating the elevating tables.

The mill is provided with three rolls. 4. 5 and (i. ranged a table 7, and onlthe otherside a. table 3. These tables carry the bloom 9 anld pass it back and forth through the ro ls.

Specification of Letters Patent.

Application filed October 1?, i908.

On one side of these rolls is ar- The tables are shown in the lover; position. m which position the bloomfis passed through the lower rolls. The bloom Patented Talley 2T5. i't fl Serial Etc. Maser.

is shown as now located upon, the taliile 7 from. here it is passed through the lower rolls 5 and 0 to the table 8 then the ta Lies are raised and the bloom passed throi the upper rolls 4 and 5 back to the table When the tables are again lowered this same cycle of operation is repeated. The table 7' is mounted upon rods id and 11, the lower ends of which are connected to hell crank levers l3 and 1 1- res 'iectively, which carry counter weights 1:? and 16. These levers are mounted upon pivots 17 and 18 and are connected by av link 19. The table 8 is mounted upon rods 20 and 21, thelower ends of which are connected to hell crank levers 22 and 23 respectively, which are supported upon pivots 24- and 25. These levels carry counter weights 26, and are connected by a link 29. The bell crank levers 2'2 and 14 are connected hy'aylinlr 30. The bell crank lever 2izllis connected to a crank 31 by means of pitman 32. 'lhecrank may be formed by an arm 33 and a gear 3%, between which extends thecranli pin to which the pitman is coimected. The crank, is driven by a motor 35 which drives the gear 34 through pinion 3G, gear 37, jar-la shaft 38. and pinion 39. In order to elcvate the-table the crank is rotated 180 de grecs. thereby operating the bell cranks to raise the rods 10, ll, 20 and 21. When the motor rotates the crank 180 degrees it is stopped. When it is desired to again lower the tables the motor is again started and runs until the crank has been rotated another 180 degrees, or back to the position which is illustrated in the drawing. The elevating mechanism is thus operated to raise and lower the tables. Of course. the

mechanical structure which is em iiloyed to\ then automatically stopped after it has opertited the crank 180 degrees, 01? performed "some other definite cycle of operation. controller is illustratlid diagrannnatically in Fig. 3. The drawing merely Shaw's the gen: eral features of the control system. in a acherod matic way, and various devices, which would "be sed in connection therewith in practice,

have been discharged so as to illustrate my invention in a simple manner.

I have illustrated a compound motor, having an armature A, a series field F, and shunt field S. In the motor circuit is arranged a brake solenoid B, which controls in suitable manner, the operation of a mechanical brake for holding the table elevating mechanism in a stationary position. Also in the motor circuit. are resistances R and R which are controlled by switches 40 and 41, adaptedto short-circuit the same. These switches are actuated by solenoids 42 and 43 respectively. The main motor circuit is controlled by main line switches 44 and 45, one on each side of the motor, which switches are actuated by solenoids 46 and 46, respectively. I provide a switch 47,

actuated by solenoid 48, for the purpose of connecting a resistance 49 around the motor armature. I also provide a switch 50, actuated by solenoid 51, for the purpose of connecting the short-circuit around the motor armature. The circuits controlled by the switches 47 and 50 serve to cause the motor to become a generator and act as a dynamic brake when it is running under the inertia of its load, hence, these circuits would be called the dynamic braking circuits. and in these circuits may be included such instrumentalities as may be desired. The circuits of the operating solenoids of the aforesaid switches are' controlled by relays 1 and r. The relay r has two contacts, 52 and 3 which are actuated by solenoid 54-. \Vhen the relay is deiinergized contact is closed,

and when it is energized contact 52 is closed. Relay 1" is provided with contacts '50. which are actuated by solenoid 57. When relay 1- is dei nergize'd contact 56 is closed. and when it is energized contact 55 is closed. The,contacts of'relay a and 7' control circuits leading to the operating solenoids ol the several switches. In circuit with the .solenoids 54c and 57 are resistances and The operation of the switches to start the motor is directed by means' of a master controller M. It is assumed that the master controller is of the drum type,'and a plan of this controller is illustrated in the drawing. Extending on both sides of the drum is a segment a, on the left hand side of the drum are segments 1). c, d and e, and onthe in unison with the motor.

right hand side segments 7, g, It and 2', in the middle of the drum a segment 70. These segments are adapted to engage stationary contact fingers, which are shown by circles arranged in alinemcnt down the center of the controller. The controller is illustrated in the central or oil position. It may be moved to bring either the right or left hand segments into engagement with the lingers. If it be moved to bring the right hand segments into engagement with the lingers, the tables will be raised, and it it be moved to bring the left hand segments into engagement with the fingers the tables will be lowered. The drum has three positions on each side of the central position. These positions are indicated by dotted lines.

The motor is automatically stopped by means of a limit switch L, which is diagrainmatically illustrated in the drawing. The

limit switch has a rotatable arm 60, which is illustrated by dotted lines. This arm is connected or geared to the motor, or mechanism ope gated thereby, so as to be rotated The arm carries on one side of its pivot two electrically connected brushes Gland 62, and on the other side two electrically connected brushes 63 and 64. The brush 64: engages ring 65, and the brush 62 ring 66. These rings are connected to solenoids 5st and 57 respectively of the relays. In the path of brush 61 is button 67 and button 68, arranged on opposite side The segments between these buttons (37 and 68, on which brush 61 travels, are dead; in the path of brush (53 are buttons 69 and 70, arranged upon opposite sides. The segments between these buttons on which the brush travels, aria dead. Buttons 7 and 69, through conductor 71, are connected together, both are connected to the contact finger of segment 6 oi. the drum controller. Buttons 70 and (38 are likewise connected by conductor 72, both are connected to the contact finger ot' scgmcnt f of the master controller. \Vhcn the contact arm of the limit switch is in the position shown in the drawing, no circuits are closed thereby.

Current for operating the motor is taken I shall now describe the operation of the controller.

i Let it be assumed that it is desired to run the motor to raise the table. Accordingly the master switch is moved to bring the right hand segments into engagement. with the contact fingers. While. the controller is in the central or oil position, the central contact 70 makes contact with its finger, which closes the circuit of solenoid 48, which closes switch 47. The contact finger which is engaged by segment a is connected to the pmitive line through conductor 74, hence all from the line through a suitableline switch the segments of the master controller ore electrically connected to the positive line. The circuit of solenoid 48 extends from segment. 7c through conductor 7 5, conductor 7 6, solenoid so, conductor 77, and conductor 78 to the negzttiye line. Switch'? connects resistance 41-9 across the motor armature when the muster controller is in the ofi position. (inc of the purposes of this switch is to molre the motor act as :1 dynamic broke whenever the master coi'i'troller is turned to the ofi posit-ion to sthp the motor before the motor is stopped by the limit switch. When the. controller is moved to the first right gs hand position, segments f and g engage their respective segments. :5 cntf connects buttons 68 and 70 oi the limitswitcht-o the positive line through conductor 73;). Segment: g connects solenoids 46 and 46 in circuimhereby closing main switches 44 and 45. "ll'ie circu of these solenoids extend from segment 9 ti 'ough conductor 80, conductor Si, relay cont ct 56, and here divides, one bronco extending: through conductor 8% and sols 56 conductor 83, to the negative y ie other branch extends through in. or 84., solenoid to the negative line. The switch 47 is now open. The motor ci cuit extends from thepositive line switch 45, resistance R and R lenoid b, armature A, series field to the negative line. The motor hrelse solenoid is energized and mechanical brake. The shunt suit extends from the positive line conductor 85 and shunt field S, the negative line, As the The .c.cnoid 42 extends from segment conductor 86, conductor 87, sole- .i'ioid conductor 88, relaycontnct 53,-condoctor 89,-conduotor 90, to the negatireline. The circuit. of solenoid 43 extends from segment 2' w s, mold e3, conductor 94, conductor 83', re-

lny contect conductor 89 and conductor 90, to the negative line. The. motor is now .i-unningr at fullsneed. 4 I If it he desired to stop the motor at any 88 time before the motor is autorjnfiiically stopped. the limit switch, the master controller may he returned to the: off position, thereby first reinsercing the starting res once. then opening the motor circuit, and a finally closingswitch 47 to connect the re nice 49 across the inn-tor armature to x'moke themotor not as a dynamic brake.

"l-lhen motor is running, the arm 60 of ,the limitswitch is rotated clock- Wise in uni- "on son with t e motor.- It so operated that.

flirted with all the resistance in cir roller is moved to the secondand lrongh conductor 91, conductor 92,

when the crank 31 has been rotated 180 degrees, thereby raising the tables, it will have rotated 180 degrees and stopped the motor.

I shall now describe the manner in which the limit switch stops the motor.

As the arm 60 approaches the end ofthe 180 degree movement, the brush 63 momenturily engages button 70, thereby bridging said button and contact. ring 65. Accordingly the resistance 58 is bridged and relay '2'- operuted. The circuit of solenoid or relay 1', extends'from contact segment f of themuster switch, througl'l conductor '79, button 70, brushes 63 and 64,- rin 65, conductor 95, conductor 96, solenoid 54-, conductor 90, to the negative line. Contact 53 now opens the circuit of solenoids 42 and 51nd 41. The resistances and R? are thus reinserted in the motor circul't thererelay 1" now closes the circuit of solenoid 4.8,

nects resistance 49 across the motor armature, thereby forming 3 dynamic braking circuit. .The circuitof solenoid 48 extends from positive line through conductor 97, contact 52, conduct0r 76, solenoid 48, c0ndoctor 78, to the negative line. movement o-f.the arm of the limit switch causes button 61 to momentarily engage but ton'68, thereby causing brushes 61 and 62 to bridge said button and contactring 66. The resistance 59 is now shortcircuited, thereby causing relay 7" to close. The cir from segment f, of the master switch, through conductor 79, conductor 7 2, button 68, brushes61 and 62, ring 66, conductor 98, solenoid 57 nndconduc-tor 90, to the negative line. Contact 56 is now open and contact 55 closed. Contact 56 thus opens the circuit of solen0ids46 and 46, and accord inglytnain switches and 45am opened, thereby breaking the motor circuit. Contact closes the circuit of solenoid 51, thereby closing switch 50, which connects :1

thereby causing the dynamic braking action of the motor tobc increased. The circuit of solenoid 51 extends from the positive line through conductor 97, contact 55, conductor 99, solenoid 5i, conductor 78,- to the nega- *tive line. The brushes 63 and 61 simply momentarily engage buttons and68. re spectively, as the arm approaches the limit of 180 degrees movement. After the circuits of the solenoids of relays 2* and r are broken at the limit switch, the solenoids 54- ontl 57 remain energized, the somebeing connected in circuit from segment r of the master switch, through conductor 81, thence (lividingly through resistance 58 and 59, and solenoids 54 and 57, and then through 43, thereby causing the opening of switches- .by slowing down the motor. Contact 52 of thereby closing switch 47. This switch conconductor to the negative line. These Further cuit of solenoid 57 oft-his relay extends short-circuit across the motor armature, I

ments of the dynamic braking circuits may,

be provided. The dynamic braking circuits cause the motor to become a generator,

whereby it is quickly brought to rest. The motor is stopped when the crank and tht limit switch arm com letes a 180degree movement, and then tlie table is elevated. The master switch is now returned to the 'initial or ofi' position, thereby 'deener izing solenoids 54 and 57 and dropping re ays 1' and 9-. To lower the tables, the'master controller is turned to bring the left hand segments of the master switch into contact with the fingers. The segment I) in the first position establishes the circuits which were previously established by the segment r accordingly the motor circuit is closed. As the controller is moved to the second and third left hand positions, the segments 0 and (Z cause the operation of the resistance switches 40 and 41 in the same manner as segments 71. and 2'; The motor is thus started, and as the crank isrotated through 180 degrees movement the tables are lowered. The segment (1 engages its contact, thereby closing circuit from the positive line through conductor 100 to contact buttons 67 and (3!). The contact button (39 'is momen= tarily engaged by the brush ('6, and contact button (37- similarly engaged by brush 61, as the cont act arm of the limit switch approaches the limit of 1550 degrees movement. Accordingly relays r and r are again op-- craled in thcmanucr previously described, thereby st pping the motor at the end of 18v) degrees movement. The tables are thus lowered.

()i course, various changes may be made in the control system which I have illustraled in the drawing without in anyway dcpartingfrom my invention as defined by the claims presented herewith.

The drawings merely show one form which the controller may assumein practice. and it is obvious that various other structures may be devised to accomplish the same results.

What I claim as new and desire to secure by Letters Patent is 1. The combination with an elevating table of a rolling mill, of means for raising and lowering said table, a motor for operating said means, an electromagnetically operated switch for starting said motor, an

electromagnetically operated switch for connecting a dynamic braking circuit around said motdr, a relay for controlling the operation of said switches, and a limit switch for causing said relay to operate to stop said motor when said table is in its upper or lower positions,

2. The combination with an elevating table of a rolling mill, of means for raising and lowering said table,a motor for operating said means, an electromagnetically operated switch for starting said motor, an electromagnetically operated switch for connecting a dynamic braking circuit around said motor, a relay for controlling the operation of said switches, a limit switch for causing said relay to operate to stop said motor when said table is in its upper or lower position, and a master switch for con trolling said electromagnetically operated switches.

3. The combination with an elevating table of a rolling mill, of means for raising and lowering said table, a motor for'operating said means, electromagnetically operated switches for starting said motor, electromagnetically operated switches for establishing a dynamic braking circuit for the motor, and a limit switch movable in unison with the motor in a single direction for causing said switches to stop the motor to brin said table ,to rest in its extreme upper and ower positions, said limit switch being adapted to, first cause certain of said switches to operate to slowdown. the motor and then cause other of saidswitches to operate to certain of said switches to slow down the motor, and the-other relay being adapted to cause. other of said switches to stop the motor, and a limit switch movable in unison with the motor for causing said relays to' operate successively to stop the motor when said table is in its upper or lower position.

5. The combination with an elevating table of a rolling mill, of means for raising and lowering said table, a motor for operat ing said means, electromagnetically operated switches forstarting= saidmotor, electromagnetically operated switches for estab- 'lisbing a dynamic braking circuit for the m tor. relays for controlling said switches,

,one of said relays being adapted to cause certain of said switches tab slow down the motor, and the other relay. eing adapted to cause other of said switches to stop the motor. and a limit switch movable in unison v with the motor forcausing said relays to opcombination,- electromagnetically. operated mes es crate successively to stop the motor when said table 15 111 its upper or lower posit-1011,-

adopted to cause said relay to operate to" sfo lhemotor.

7. ln s control er for electric'motors, 1n

switches for startin the motor, electromagnetically operate-d switches for establishing a dynamic blilklng circuit, relays for controllmg said switches, one of said relays be-' ing srranged to cause certain-0f said startiiigr and braking switches to slow down the motor, the" other of said relays being arranged to caiise other of said starting and braking switches to stop the motor, and a limit sy'vitc'l'l movable-in unison with the motor, ssid'limit switch, when moved a predetermined distance, being arranged to cause, said relays to operate successively.

8. In a controller for electric motors, in combination, electromagnetically operated switches for starting the motor, electromagnetically operated switches for establishing a dynamic brakin circuit, "rela s for con-i trolling said switc es, one ofsai relaysbeing arranged to cause certain of said start- .ing and braking switches vto slow down the motor, and the other of said relays being ar ranged to cause other of said starting and braking switches to stop the motor, and a limit switch movable in unison with the mocause other of said switches to stop tor, said limit switch, when moved predetermined distance, being arranged to said relays to operate successively, a. master switch for controlling the ci'rcn' the operating windings of said electroini netiically operated switches.

9. In combination a motor, a crenli: oth r ated thereby, an electrics ated switch for starting h tromagnetimill'y' operated s lishing a dynamic brsh motor, a relay for ccictrctv and a limit swi the motor and er a; to operate to stop t '2; is in a predetermi. a position, and ter switch for controlling said. clr netically operotedswitches. i so 10, In combination a motor, a crank op erated thereby, electromagnetically 'oper ated switches for starting the motor, electromagnetically operated switches for establishing dynamic braking circuits for the motor, a pair of relays for controlling said switches, one of said relays being arranged to cause certain of said starting and braking switches to slow down the motor, and the other of said relays being arranged to the motor, and a limit switch movable 1n unison with the motor, said limit switch being arranged to cause the successive operation of said relays to stop the motor when said crank is in predetermined positions.

'In witness whereof, I. have hereunto enhscribed my name in the presence of two witnesses.

CLARK T. HELQ'DYLWQQIL Witnesses: V

F. S.- WnuHorr, R. M. VAN Vmrr 

